05-06-2011
Open/close of ports
Hi,
I have read some forum theads about the open and close ports. some points are clear and it is not working on my machine or something am i missing?
I have commented out a port /etc/services, one application uses
then when i use the telnet <hostname[localhost]> <port_blocked> it shows connected..
ideally it should not come right?
Or Am i missing anything here?
Thanks,
Bala
---------- Post updated at 06:23 PM ---------- Previous update was at 05:51 PM ----------
This is the steps I followed
1. I stopped the service which is running on 3500 port
2. checked the netstat -an | grep 3500 ==> no outputs
3. checked the port in /etc/services, it is commented out
4. ran this command
su root -c "/etc/init.d/xinetd restart"
Stopping xinetd: [ OK ]
Starting xinetd: [ OK ]
5. telnet mypc.com 3500
Trying 10.177.58.254...
telnet: connect to address 10.177.58.254: Connection refused
telnet: Unable to connect to remote host: Connection refused
This looks good, as expected i believe
6. Now I started the service on the port 3500
7. Service started successfully ?? How, it should not right?
8. Issue the telnet
telnet mypc.com 3500
Trying 10.177.58.254...
Connected to mypc.com (10.177.58.254).
Escape character is '^]'.
Now it is connected...
Am i somewhere wrong here?
I want to close the port.. but it is not working.
Pl assist me here.
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LEARN ABOUT CENTOS
telnet-probe
TELNET-PROBE(1) General Commands Manual TELNET-PROBE(1)
NAME
telnet-probe - lightweight telnet-like port probe
SYNOPSIS
$PCP_BINADM_DIR/telnet-probe [-c] [-v] host port
DESCRIPTION
telnet-probe allows the pmdashping(1) daemons to establish connections to arbitrary local and remote service-providing daemons so that
response time and service availability information can be obtained.
The required host and port number arguments have the same meaning as their telnet(1) equivalents.
The -c option causes telnet-probe to perform a connect(2) only. This skips the read(2) and write(2) exercise that would otherwise be done
after connecting (see below).
The -v option causes telnet-probe to be verbose while operating.
Once the telnet connection has been established, telnet-probe reads from stdin until end-of-file, and writes all the input data to the tel-
net connection. Next, telnet-probe will read from the telnet connection until end-of-file, discarding whatever data it receives. Then
telnet-probe exits.
To operate successfully, the input passed via telnet-probe to the remote service must be sufficient to cause the remote service to close
the connection when the last line of input has been processed, e.g. ending with ``quit'' when probing SMTP on port 25.
By default telnet-probe will not produce any output, unless there is an error in which case a diagnostic message can be displayed (in ver-
bose mode only) and the exit status will be non-zero indicating a failure.
PCP ENVIRONMENT
Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the
file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configura-
tion file, as described in pcp.conf(5).
DIAGNOSTICS
If telnet-probe succeeds, then 0 will be returned. If the attempt to establish a connection fails or is terminated, then a non-zero exit
status is returned.
SEE ALSO
PCPintro(1), pmdashping(1), pmie(1), telnet(1), connect(2), read(2) and write(2).
Performance Co-Pilot PCP TELNET-PROBE(1)